Engine ticking at idle or under power but no noise while coasting. Sounds like a lifter on an old chevy V8, but this engine has rocker arms right off the cam. Already adjusted the valve stem clearances and cleaned the carbon from the combustion chambers, motor flush and fresh oil and filter, quality gasoline and gumout for two tanks. no change in the ticking. looking for a Vtec Air adapter # 07VAJ-P8A010A.